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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Direct losses and loss adjustment expenses |  | $ 1,269,344 | $ 264,068 | $ 1,724,729 | $ 777,668
Losses and loss adjustment expenses | $ 45,000 | 330,444 | 187,581 | 715,854 | 498,765
Ceded losses and loss adjustment expenses | 66,000 | 938,900 | 76,487 | 1,008,875 | 278,903
Incurred related to prior years |  | 2,715 | 11,489 | 7,080 | 17,983
Adverse Prior Years' Reserve Development |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Direct losses and loss adjustment expenses |  | 26,400 | 87,900 | 100,600 | 296,900
Ceded losses and loss adjustment expenses |  | 23,700 | 76,400 | 93,500 | 278,900
Incurred related to prior years |  | $ 2,700 | 11,500 | 7,100 | 18,000
Hurricane |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Direct losses and loss adjustment expenses |  |  | 81,700 |  | 282,900
Ceded losses and loss adjustment expenses |  |  | 76,400 |  | 278,900
Incurred related to prior years |  |  | 5,300 |  | 4,000
Hurricane Ian |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Direct losses and loss adjustment expenses | 1,000,000 |  |  |  |
Reinsurance tower | 3,000,000 |  |  |  |
Losses and loss adjustment expenses |  |  |  | 111,000 |
Ceded losses and loss adjustment expenses | $ 66,000 |  |  |  |
Hurricane Irma |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Direct losses and loss adjustment expenses |  |  |  | 76,200 |
Ceded losses and loss adjustment expenses |  |  |  | 69,200 |
Incurred related to prior years |  |  |  | 7,000 |
Hurricane Matthew |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Incurred related to prior years |  |  |  | $ 100 |
Settlement on Litigated Claims |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Incurred related to prior years |  |  | $ 6,200 |  | $ 14,000

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